Hacksaw and frame therefor



Nov. 10, 1959 w. K. THOMAS 2,912,025

HACKSAW AND FRAME THEREFOR Filed July 7, 1958 34 5 r m 28 60, a 5 I {742E123} IN V EN TOR.

//&ZZ zbM/a 7/32/2145 United States Patent HACKSAW AND FRAME THEREFOR William K. Thomas, Chicago, 111. Application July 7, 1958, Serial No. 746,966

4 Claims. (Cl. 145-34) This invention relates to mechanics tools, and more especially to a hacksaw and adjustable frame therefor.

It is an object of this invention to provide a hacksaw embodying a frame which may not only be adjustable lengthwise, but laterally as well.

Another object of this invention is to provide a hacksaw embodying a frame with tubular parts in which means are provided for adjustment for various lengths of saw blade, and in which tubular fittings are provided to increase the depth of the frame.

A further object of this invention is to provide means assembled with the lower ends of the frame whereby the hacksaw blade may be adjusted annularly upon its axis in a plurality of positions, and held in a positive adjustable position.

A still further object of this invention is to provide a hacksaw embodying two solid upright members, a horizontal cross-bar member, and suitable fittings, the cross-bar member consisting of a tubular center piece assembled'upon a plurality of horizontally arranged bar members rigidly secured with said fittings, said tubular center piece being adjustable upon one of said bar members. T

And still a further object of this invention is to provide a hacksaw and frame therefor, the major constitucuts are fabricated of metal sections and metal fittings, which is safe, economical and convenient to assemble, and by the use of which any size frame can be formed from the required length of pipe.

Still a further object of this invention is the provision of a hacksaw embodying a frame of such construction as to secure rigidity and strength with a minimum of weight.

These and other objects and advantages of this invention will be fully set forth in the following description, made in connection with the accompanying drawing in which like reference characters refer to similar parts through the views and in which:

Figure 1 is a side elevational view of the hacksaw according to this invention ready for use, with two adjustable positions of the frame indicated by broken lines;

Figure 2 is a perspective view illustrating an embodiment of the hacksaw of my invention, showing the opposite side thereof from that shown in Figure 1;

Figure 3 is an enlarged fragmentary sectional view taken substantially on the line 3-3 of Figure 1;

Figure 4 is a detail sectional view taken substantially on line 4-4 of Figure 3;

Figure 5 is a detail sectional view taken substantially on line 5-5 of Figure 3; and

Figure 6 is a side view of a saw blade of greater length than the blade shown in Figure 1.

While I have illustrated a form of my invention as embodied in a hacksaw, it is understood that I contemplate the application of the principles of my invention to any relative light weight construction, but strong and sturdy forming a frame for a saw, or mechanics tool.

Referring to the drawings in detail, the hacksaw construction illustrated is inclusive of a frame 10, saw blade 11, and handle 12. The frame 10 comprises two sections 14 and 15, the vertical posts 16 and 17 being arranged parallel to one another and held in said position by assembled cross-member 18. Said cross-member 18 composed of a horizontal tubular extension 19 forming an integral part of T-shaped pipe fitting 20, said fitting 20 having an internal cylindrical bore 21 with two vertical outlets, an upwardly extending outlet 22 and a downwardly extending outlet 23. A solid metal reinforcing cylindrical stem 25 is riveted within said tubular extension 19, adjacent said T-shaped fitting 20, by rivets 26 which are assembled in transverse holes formed in said extension 19 and stem 25. A pipe cap 27 is pinned to the uppermost end of the vertical post 16 by pin 24.

Said cross-member 18 forms a sleeve, or tubular extension 19, the cylindrical bore thereof being inclose fitting engagement with the cylindrical bar 28 forming a part of section 15 and rigidly secured to the X-shaped pipe fitting 30. Said fitting 30 having a horizontal cylindrical bore 31 and a vertical cylindrical bore 32, said bar 28 extending through said horizontal bore 31 and forming an external tenon not shown. Said bar 28 is riveted to said fitting 30 by rivet 33 and forms a male member to which the handle 12 is rigidly secured by rivet 34. A pipe cap 37 is assembled and riveted by rivet 38 to the uppermost end of the vertical post 17 extending through the fitting 30; i

The vertical posts 16 and'17 are provided with a plurality of sets of transverse arranged holes, the sets of holes 40, 41 and 42 in post 16 being in horizontal alignment with the sets of holes 44, 45, 46 in post 17. The fittings 20 and 30 are pinned to said rods 16 and 17 and are adjustably movable thereon. Removable pins 50 are inserted in holes 55 in fitting 20 and in holes 42 in bar 16, as shown by Figure 1, to secure the fitting 20 in position with post 16. Removable pins 52 are inserted in holes 56 in. fitting 30 and in holes 46 to secure the fitting 30 in position shown with post 17. When it is desired to move the cross-member 18 closer to the saw blade 11 as desired, the pins 50 and 52 are removed, the fittings 20 and 30 may be moved to the dotted position shown by Figure 1, and the pins inserted through holes 55 and 56 in the fittings which correspond with holes 40 and 44 in the posts 16 and 17 respectively. The fittings 20 and 30 may be moved to an intermediate position and maintained in position by placing pins 50 and 52 in holes 41 and 45 of said posts 16 and 17 respectively.

The bar member 28 rigidly secured to the fitting 30 is provided with a plurality of vertical, equally spaced, inverted cone shaped bores 60, 61 and 62, shown by Figure 1. The sleeve 19 is provided with apertures 60 and 60", 61' and 61", and 62' and 62" which correspond in location with bores 60, 61 and 62 respectively. A removable, tapered pin 70 with enlarged head 71 is shown in bore 61 and apertures 61' and 61", by Figure 1. By removal of said tapered pin 70 the bar 28 can be moved within said sleeve 19. The pin 70 may be replaced in any one of the bores 60, 61 or 62 according to the adjustable, desired length, according to the length of the saw blade 11 in use; the frame is shown extended, by broken lines in Figure 1, as is necessary when using a blade 11' shown by Figure 6. There is shown clearance space 65, should it be desired to shorten the length of the frame for use with a blade shorter than that shown by Figures 1 or 6.

The ends 75 and 76 of the sections 14 and 15 are provided with pipe caps 79 pinned thereon by pins 86. Said ends 75 and 76 and said caps 79 are provided with female blade supporting tubular units 77 and 78 of substantially rectangular cross section, said units also provided with ears 80 riveted within slots 81 within said ends 75 and 76. The units are provided with movable plugs 82 and 83, intermediate portions 84 and 85 of each forming a male section of rectangular cross section to fit within said female units 77 and 78. The outer end of plug 82 is provided with an enlarged head 88. The outer end of plug 83 is threaded to receive a wing-nut 89. The inner ends of said plugs 82 and 83 are provided with angularly disposed studs 91 to enter the apertures of the saw blades in use. By loosening the wing-nut the plugs 82 and 83 are loosened whereby the blade may be disconnected or connected. It will be observed that by providing the rectangular configuration to units 77 and 78, the plugs may be turned ninety degrees to one side or the other. Therefore, the blade can be assembled in a plurality of planes as desired when in use.

In practice, the ordinary hack-saw is provided with a hingeable type cross-member. When undue pressure is applied to the frame, the cross-member will buckle causing the blade to break. Applicants saw frame cannot buckle due to the telescoping of the parts in its crossmember, and the rigidity thereof by use of the tapered locking pin.

In a number of instances, in using a hacksaw it has been found necessary to adjust the blade with one hand, while holding that which is being sawed with the other hand, and heretofore this could not be accomplished, owing to the fact that the cross-member would buckle if the blade was removed, or the wing-nut loosened. Applicants hacksaw frame is an adjustable, but substantially rigid frame until the adjusting pin is removed from the cross-member. Therefore, one hand can be used with the saw and one with thework being sawed, even when the blade is being changed or adjusted. A longer or shorter blade can even be inserted in the frame by the use of only one hand.

It will be understood that modifications and variations may be effected without departing from the scope of the novel concepts of the present invention.

I claim as my invention:

1. A hacksaw comprising vertical cylindrical end bars,

saw supporting means at the lower free ends of said bars, a tubular coupling slidably mounted upon each of said vertical bars, one of said couplings being of X-shaped configuration and embodying a horizontal cylindrical bar, the other of said couplings being of T-shaped configuration and embodying a horizontal cylindrical sleeve, said horizontal bar slidably mounted within said sleeve forming a cross-member, the diameter of said horizontal bar being slightly less than the internal diameter of said sleeve but substantially the same, and means permitting adjustment of said horizontal bar within said sleeve relative to each other whereby said cross-member may be adjusted longitudinally upon its axis, means for engagement with said sleeve and said horizontal bar for holding said cross-member rigid and a handle secured with said bar secured to said coupling of X-shaped configuration.

2. A hacksaw and frame according to claim 1 wherein said saw supporting means are rectangular in cross-sectionand the intermediate portions of said plugs mounted within said units are rectangular in cross-section.

3. A hacksaw and frame according to claim 2 wherein said plugs may be mounted within said units whereby said blade may be held with its flat surface in a plane parallel with the plane of the frame.

4. A hacksaw and frame according to claim 2 wherein said plugs may be mounted within said units whereby said blade may be held with its flat surface in a plane at right angles to the plane of the frame.

References Cited in the file of this patent UNITED STATES PATENTS 371,438 Davis Oct. 11, 1887 561,353 Snell June 2, 1896 1,051,193 Burge Jan. 21, 1913 1,087,648 Dufiy Feb. 17, 1914 1,094,169 Schoenborn Apr. 21, 1914 1,470,897 Voltz Oct. 16, 1923 1,572,823 Stierheim Feb. 9,- 1926 2,603,261 Swilley July 15, 1952 FOREIGN PATENTS 537,934 Great Britain July 14, 1941 

